Consists of various materials collected and maintained by William J. Mountin, gathered in the course of his work in the Statistical Branch of the Wartime Civilian Control Administration (WCCA). Includes War Relocation Authority (WRA) and WCCA correspondence and memos concerning the administration of the office in San Francisco; copies of statistical reports and bulletins, including those compiled by the U.S. Census Bureau; sample forms, reports, maps, bulletins, and Civilian Exclusion Orders and Instruction broadsides; ephemeral publications of various official organizations concerned with the administration of the U.S. Army Western Defense Command office, including directories and organizational charts; and clippings. Also included is a handbook, or notebook, assembled from copies of executive orders and supporting materials. The handbook is one of five or six copies that existed for use by WCCA supervising officers.